Vol. 11, no.1, 2019


Lev E. Nazarov, Dmitry V. Antonov, Vitaly V. Batanov, Andrey S. Zudilin, Vladimir M. Smirnov
Kotelnikov Institute of Radioengineering and Electronics of RAS, Fryazino branch, http://fire.relarn.ru
Fryazino 141190, Moscow region, Russian Federation

Received 16.04.2019, accepted 21.04.2019
Abstract. The results of analysis for signals propagating through the ionosphere satellite communication channels with temporal and spatial electron density irregularities in the ionosphere plasma are presented in the article. These electron density irregularities most commonly occur in low-latitude, auroral, and polar regions and refer to the random signal amplitude and phase fluctuations. Occurrence of scintillation is difficult to predict and model due to the variability of its numerous influencing factors, which include solar activities, inter-planetary magnetic field activities, local electric field and conductivity, convection processes, wave interactions. Satellite ionospheric radio waves in P-, L- frequency bands are vulnerable to scintillations that can severely impact the acquisition and tracking process in receivers, causing a degradation in navigation and in information systems (as example, Kospas-Sarsat system) solution accuracy, integrity, and continuity. The widely-used indice to measure ionospheric scintillation activity is the scintillation index for amplitude scintillation (the standard deviation of the received signal power normalized to the average signal power). The values of scintillation index (0.27…0.49) for Cospas-Sarsat channel (406.0-406.1 MHz) are evaluated in the article. The empirical model for probability density for signal amplitude as m-law Nakagami based on these values of scintillation index is used to evaluate error-performance degradation concerning to propagation through free space. The computer simulations for evaluation of these error-performance degradations are performed - the degradation of signal/noise is about 6.8 dB for bit-error 0.001.

Keywords: satellite ionosphere channels, signals, signal scintillations, error-performances, signals, phase shift keying signals, Kospas-Sarsat

UDC 621.391.01

RENSIT, 2019, 11(1):57-64 DOI: 10.17725/rensit.2019.11.057

Full-text electronic version of this article - web site http://en.rensit.ru/vypuski/article/270/11(1)57-64e.pdf